Intercooler Piping size / Configuration

[Sil8ty]

Just about to start on pipe work on my intercooler setup.

This has probably been discussed many of times b4..... But here goes....

I am possibly going to use 2.25" S/Steel pipe for the turbo discharge and run it across the front of the engine down to the cooler inlet on the drivers side.

With the return pipe up to the engine i am going to us 2.5" S/Steel up th the T/Body with a 3" expander up to where the factory pipe is now to the T/Body.

Question: Is this pipe adequate in size. I have seen people use larger tubing, but i have heard the larger you go the more lag you may possibly get.

Question: Do you guys think the configuration of the piping will be okay?? As i have seen it done the other way around.... Turbo to cooler on passanger side, Return to T/Body up on the drivers, along the front of the engine.

I hope this is clear enough.....

[Bugalugs]

I`ve just finished mine in 2 1/2 inch.It runs opposite to normal (turbo side x/over).I only done it in mild steel cause thats all i can weld but i will be getting a HPC when i get around to it.I havnt found it to have anymore lag as usual but i had the car dynoed at Tilbrooks Dyno Day and i got 204rwkw.The only mods i have are zorst,hi/flow cat,front pipe,pod,bleed valve(running 12PSI) and FMIC.I dont know what i had in KW before then but it seems to have more power now and with those figures i am quite happy.

Ring Gordon from AAA exhaust they can help you out with s/steel mandrel bends,expanding and welding if needed.My pipe work cost me about $70 all up(from turbz to throttle body).

Matt

[HEL-RZA]

Originally posted by Sil8ty

I am possibly going to use 2.25" S/Steel pipe for the turbo discharge and run it across the front of the engine down to the cooler inlet on the drivers side.

With the return pipe up to the engine i am going to us 2.5" S/Steel up th the T/Body with a 3" expander up to where the factory pipe is now to the T/Body.

im going to configure the piping in this way as well. im not sure about the piping size but ive heard that to minimise the lag the piping should be the same size as the IC inlet and outlet. can any one conferm this?? :confused:

[GTR-80Y]

Bugalugs: u sure ure not running an aftermarket computer? 204rwkw is quite a bit for those mods. Typically ure mods should get about 160wrkw.

[Doctor]

You would get more than 160. I saw a dead stock RB25 put put 150 last night only 20000kms on the clock.. You would get about 180 odd with those mods I reckon. Might be just a very fresh engine.

[lowlux]

has any1 got any pics of pipeing,as i think this would help us ALOT,im actually 1/2 way through making my pipeing,and im doing the same as bugalugs, ive got a r31 but im sure u r32 guys would have the same prob with the battery,also the radiator hose that sits smack bang in the way? ive thinking of getting a new hose,but is there a bettter way?

[EnricoPalazzo]

No offence to anyone, but on the Skyline/LS1 dyno day, it seemed the Tilbrroks dyno was readin high.:burnout:

[GTR-80Y]

my stock as a rock RB25det got 125rwkws.......although she was (and still is) runnin very rich. Dynos can be so decieving...cheeky little buggas! :lol:

[Bugalugs]

Enrico-Are u saying atleast 20kw-40kw more you think?I dont think a dyno would be reading that much difference.How much difference do ya reckon?

Whatsisname got 10kw more than his last dyno(RPM`s dyno after an hour of tuning the turbo glowing red hot).

There was another guy with the same mods(piping different to mine) aswell as a FCD which did a 199rwkw.

GTR 8OY-I have had my ECU out but it looks original with no stickers on it but saying that my A/FR was just about spot on,they reckon i wouldnt get much better with an aftermarket ecu.Come to think of it i still have the 180speed limiter and redlines where it should so i dont know.

I havnt got any pics of the piping.

Matt

[whatsisname]

Having had a good hard look @ Bug's dyno sheet I'd say his car/ECU is a freak!

The A/FR's were perfect (& I mean perfect!) through the entire rev range, peaking @ 12.3:1 top end. That's not normal territory for a stock RB25DET ECU :confused: On top of that the AFM didn't pull timing @ ALL!!!

2 things the standard R33 ECU does well - Run rich (very rich) & pull timing. Hence the low rwkw figures from untouched ECU'd cars (regardless of other mod's).

I too thought the dyno might have been a little optimistic? But when you look @ the other figure from cars on the day they all matched up pretty well (level of mods to rwkw) i.e. a stock R32 GTS-t - 106rwkw, & a blown/intercooled/LS1edited VX 255 CS - 304rwkw.

Lets ignore Bug's individual rwkw figure for a sec' & instead compare it to the other cars & their respective modifications (same dyno, same settings, same day).

204rwkw R33 - the usual bolt-ons & remarkable A/FR's!

245rwkw VU SS Ute - with the following:

4 into 1 Custom headers by Exhaust Technology

ET Custom Twin 2.5" exhaust, x-pipe

ST - PCM recalibration - LS1 Edit

M&V Full Rebuild A4, Stage 2 Shift Kit, Trans Cooler

3.46 diff gears

84 mm STARR throttle body

TB Bypass

Sidewindr Sik TB-MAF Pipe

SS CAI + modified cold air intake

kingdragon filter

& a special "race only" exhaust for the day.

Minus the "race only" & it's closer to 235rwkw- or about what summoner is getting out of his VU SS over in WA.

"it seemed the Tilbrroks dyno was readin high"

And your reasoning is?

I must admit I was the first to jump on the bandwagon when somebody claimed 200+rwkw with stock turbo/injectors/ECU etc... Just because that's all it's "suppose to make" doesn't mean it's 100% gospel in every single case. I've witnessed a fair few things that shouldn't ever be able to happen!

The real test will come when Bug's runs it down the strip. Then it's a simple case of weight + terminal speed.